Vacuum cleaner



Aug. 4, 1936. F. CARLSTEDT.

VACUUM CLEANER Filed Nov. 3

15; ATTORNEY Patented Aug. 4, 1936r PATENT OFFICE VACUUM CLEAN ER Fredrik' orlsiedt, stockholm, sweden, assignor, by mesne assignments, to Electrolux Corporation, a corporation vof Delaware ApplicationNovember 3, 1930, Serial No. '493,049 In Germany November 5, 1929 13 Claims. (Cl. 18S-37) This invention relates to vacuum cleaners and more particularly to new and improved means for the cooling of the motor., The invention is applicable to a vacuum cleaner in which the' uum cleaner in which both air-streams are mixed and lead through one and the same fan.

Other objects of the invention are: That both air-streams are mixed before entering the fan; to provide means for removing dust 15 from the separate air-stream passing through the motor, and .to provide a cheap, simple, conven-` ient and eicient device for the purpose specified. The invention also consists in certain new and original features of construction and combination of parts hereinafter set forth and claimed.

Although the novel features which are believed to be characteristic of this invention will be par; ticularly pointed out in the claims appended hereto, the invention itself as to its objects and advantages,l the mode of its operation and the manner of its organization may be better understood by referring to the following description y taken in connection with the accompanying drawing forming part thereof, in which l 3o Fig. 1 is a sectional view of a vacuum cleaner according to the invention;

Fig. 2 a plan view of' the same cleaner;

Fig. 3 is a cross sectional view of a portion of the device shown in Fig. 2; and Fig. 4 is a cross sectional view taken on the line il-Ii of Fig. 3.

In the figures, i0 denotes a casing of the cleaner and II a cover therefor. Cover II consists of two separable parts I 2 and I3 which are held together by means of screwbolts It. Cover Itis detachably secured to casing III by convenient means such as clips I5. From part I2 projections I6 extend into casing I Il forming a support for an annular member Il suitably manufactured of' any electrically insulating material. Member Il which is secured to projections I6 by means ofy plate having an opening 23, and a fiange 24 sur-d rounding said opening and extending into casing I0. To iiange 24 a dust separating member or filter cell l25 is detachably connected, said member being kept in stretched position by means of a distending frame in the form of a spiral spring 5 26. The filter cell thus defines a space within which motor I9 is located and to which space dustr and litter have no access. Fan 20 rotates in a housing formed of parts I2 and I3 which also form a volute shaped discharge channel 2l. 10 Channel 2l opens into a valve casing 28, which is provided with outlet openings 29 and which is connected with a hose 3U. f l

The interior construction of casing 28 is shown in Figs. 3 and 4. Hose 30 is secured to a 15 hollow member 4I) forming part of the casing. To the inner end of member d0 is secured one end of an elbow 4I. The other end of the elbow communicates with a passage t2 which extends through the lower part of the casing 28 to the in- 20 t'erior of casing I0. Member 22 is provided with an opening 43 in alignment with passage 42. Hence, communication is established'from hose 30 through member llIl, elbow M, passage 42 and opening 43 to casing Ill, andfrom channel 21 25 through casing 28 around the outside of elbow di to openings 29. Air is drawn in through hose '30 sioned with respect to motor I 9 and casing I0 that in operative position it will press a part of the dust separating member 25 against the bottom of casing III. That part of casing IIl which is surrounded by the'lower edge of mem- 40 ber 32 is provided with perforations 33, said part being bent slightly downwards. The part of member 25 surrounded by the lower edge of member 32 has been denoted with reference character 34. The bottom of casing I0 is bent in- 45 wards as at 35 and is provided with a radially extending channel 36, to enable air to enter perforations 33 even if the cleaner rests on the floor` or the like.

Motor I9 is at its lower end provided with 50 openings 31 and at its upper end with openings 38. Member I2 has an opening 39.

The operation `6f the vacuum cleaner no w described is as follows:

As soon as motor I9"has been started, dust 55 laden air, due to the vacuum produced by fan 20 in the fan housing, will flow in through hose 3B, member 49, elbow 4I, passage 42 and opening 43, and into casing I0. From the casing I0 the air iiows through member 25 where the dust is separated. The air then iows around motor I9, through openings 39 into the fan 20. TheV air always is passed through the motor not only when the suction nozzle is closed or nearly closed, and little or no air flows through hose 30 and the main part of dust separating member 25, but also when a large amount or maximum of air iiows through said parts. The arrangement of parts 32, 34, 33, and 36 guarantees that only clean and filtered air is sucked through motor I9. A further advantage is that part 34 must be cleansed as often as the dust separating member 25 is removed for cleaning.

What I claim is:

1. A vacuum cleaner comprising a casing, means dividing said casing into a dust separation chamber, a fan chamber and a motor chamber, a fan member in vsaid fan chamber, a motor in said motor chamber connected to rotate the fan member, and means providing a direct path from outside said casing for flow of air past said motor to cool the motor, said fan chamber having an inlet opening communicating with said dust chamber, and said path of flow being in direct communication with said inlet opening whereby air is drawn through said path of fiow and through said inlet opening into said fan chamber. l

, 2. A vacuum cleaner comprising a casing, means dividing said casing into a dust separation chamber, a fan chamber and a motor chamber, a fain in said fan chamber, a motor in said motory chamber connected to rotate said fan member, and means providing a direct path from outside said casing for ow of air past said motor to cool the motor, said fan chamber having a single inlet opening on one ,side thereof com-A municating with said dust chamber, and said path of ow being in direct communication with said inlet opening whereby air is drawn through said path of iiow and through said inlet opening into said fan chamber, said inlet opening affording access of air to the entire blade surface of the fan.

3. A vacuum cleaner comprising a casing, means including an air filter dividing said casing into a dust separation chamber, a fan chamber and a motor chamber, a fan member in said fan chamber, a motor in said motor chamber connected to rotate said fan member, and means providing a direct path from outside said casing for flow of air past said motor to cool the motor, said air filter having a portion thereof extending across said path of flow, and said fan chamber having an inlet opening communicating with said dust chamber, and said path of flow being in direct communication with said `inlet opening whereby air is drawn through said path of flow and through said inlet opening into said fan chamber.

4. A vacuum cleaner comprising a casing having an air inlet, a fan in said casing, a motor in said casing below and connected to, said fan, and a dust separating member surrounding said motor and providing a dust separation chamber outside said -member and a motor chamber inside Said member, said fan having a single inlet communicating with said motor chamber and supplying air to the entire blade surface of the fan.

5. A vacuum cleaner comprising a casing having an air inlet, a fan in said casing, a motor in said casing connected to said fan and including an apertured hood, a dust separating member surrounding said motor and providing a dust separation chamber outside said member and a motor chamber inside said member, and means cooperating with the motor hood and said casing to provide a path cf flow for air through the motor hood, said fan having a single inlet communicating with said motor chamber to draw air in parallel from the dust separation chamber and the motor hood, and said fan inlet supplying air to the entire blade surface of the fan.

6. A vacuum cleaner comprising a casing having an air inlet, a fan in said casing, a motor in said casing connected to said fan and including an apertured hood, a dust separating member surrounding said motor and providing a dust separation chamber outside said member and a motor chamber inside said member, and a tubular member of electrical insulating material cooperating with the motor hood and said casing to provide a path of flow for air through the motor hood, said fan having a single inlet communicating with said motor chamber to draw air in parallel from the dust separation chamber and the motor casing', and said fan inlet supplying air to the entire blade surface of the fan.

7. A vacuum cleaner comprising a casing, a fan in said casing, a motor housing in said casing, a motor in said housing operatively connected to said fan, a dust separating member surrounding said motor housing and providing a dust separation chamber outside said member and a motor chamber inside said member, said casing having an air inlet communicating with said dust sephousing, said fan having a single inlet communicating with said motor chamber and supplying air to the entire vblade surface of the fan, said motor `housing being formed with apertures for the flow of air from within said housing to within said motor chamber.

8. In an electric vacuum cleaner, in combination, a receptacle, a cover carried thereby, a pump carried by said cover, a motor suspended below said cover inside said receptacle and operatively connected to said pump in spaced relation, a dust separating member around said motor and spaced from the walls of said receptacle to dene a litter-chamber, the interior of said dust separating member defining a chamber about said motor to which litter has no access, an inlet fitting carried by said cover and communicating with said litter-chamber outside of said ldust separating member, and a conduit leading from the pump outlet to the outer air, the pump inlet being presented tosaid motor and communicating :ith the space inside said dust separating mem- 9. A pneumatic cleaner comprising, in combination, a hollow casing having stiff walls and a 75 cover, a iilter cell supported within said casing and spaced from the casing walls to dene a litter-chamber, a motor in said cell, a pump spaced from and driven by said motor and having its inlet communicating with the interior of said lter-cell and its outlet through said cover, said motor being located opposite to the inlet of said pump, and a suction-connection carried by said cover communicating with the space inside said casing and outside said filter-cell.

10. A pneumatic cleaner comprising, in combination, a Ahollow casing having stii walls, a pump carried by one wall having an inlet inside said casing and an outlet outside said casing, a motor in said casing spaced from and operatively connected to said pump, said inlet being located be tween said pump and said motor, a lter-'cell inside said casing surrounding said motor and communicating with said inlet, said filter-cell defining a chamber about said motor to which litter has no access, a hose connection communieating with the Vspace between said lter-cell and the casing wall, and a distending frame inside said lter-cell'.,

11. A pneumatic cleaner comprising, in combination, a hollow casing having stiiT walls, a frame carried by one of said walls and projecting into the casing, filtering material carried by said frame andV separating the space inside the same from the rest of the casing, the space outside of said filter constituting a litter-chamber, an electric motor located inside said lter, a pump operatively connected to said notor in spaced relation and having its inlet presented to said motor in free communication with the space inside said iilter and its outlet discharging outside of said casing, and a" hose-connection carried by a part of said casing and communicating with said litter-chamber. A

12. A pneumatic cleaner comprising, in combination, an upright dust receptacle having im E periorate walls, a removable cover for said receptacle, means detachably securing said cover to said receptacle, a suction pump carried by said cover and having an inlet and an outlet, an electric motor operatively connected to said pump in l0 spaced relation in front of the inlet opening thereof, a filtering element of pervious material car ried by said receptacle and depending into said receptacle and spaced from the walls thereof, the inner Wall of said ltering element defining a l5 suction chamber and communicating with said inlet, and the exterior thereof defining with said receptacle a litter chamber, and a hose connection carried by said cover and communicating with said litter-chamber. 20 13. In a vacuum cleaner, a casing formed with a dust ladened air inlet and a clean air outlet, a dust separating member in said casing having a portion disposed between said inlet and said outlet, a motor, means providing a path of ow 25 of air independently of said dust ladened air inlet from the atmosphere past said motor, another portion of said dust separating member being disposed across said path of flow between the atmosphere and said motor, and means driven 30 by said motor for producing flow of air through said dust ladened air inlet,-said dust separating member and said outlet, and for producing an independent flow of air through said path of flow.' 35

` FREDRIK CARLSTEDT. 

